<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style type="text/css">
        .walk_show{
            width:120px;
            height:182px;
            border:1px solid #333;
            margin:50px auto 0;
            overflow:hidden;
            position:relative;            
        }
        .walk_show img{
            position:absolute;
            left:0px;
            top:0px;
        }
    </style>
    <script type="text/javascript">
        window.onload = function(){
            var oImg = document.getElementById('img01');
            var nowleft = 0;

            setInterval(function(){
                nowleft -= 120;

                if(nowleft<-840)
                {
                    nowleft=0;
                }

                oImg.style.left = nowleft + 'px';

            },120)

        }

    </script>
</head>
<body>
    <p>使用下面这张图片制作关键帧动画</p>
    <img src="images/walking.png" alt="人物走路">
    <div class="walk_show">
        <img src="images/walking.png" alt="人物走路" id="img01">
    </div>
</body>
</html>